/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineDeviceNotificationInterface.h
Initiate the create/register device process
void RegisterDevice ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & LocalUserId, const [FString](API\Runtime\Core\Containers\FString) & InstanceId, const [FString](API\Runtime\Core\Containers\FString) & ChannelType, const [FOnRegisterDeviceComplete](API\Plugins\OnlineSubsystem\Interfaces\FOnRegisterDeviceComplete) & Delegate )